The LAV-AT used the "hammerhead" TOW launcher turret originally found on the ITV M901, and mounted it slightly offset to the hull's left rear corner. The deck of the rear hull was redesigned to incorporated a hatch that provided the loader some protection as he attended his duties. The vehicle's fuel tank occupied the same position as that on the LAV-M, on the left-hand side of the hull rear, and likewise smoke grenade launchers were mounted on the hull roof. Missile stowage racks were placed on the right side of the passenger compartment opposite the loader.

The LAV-AT underwent upgrades to -A1 and -A2 standard like the LAV-25.

The various versions of the TOW missile are as follows: BGM-71A was the basic version with a 5" (13cm) diameter warhead. BGM-71C ITOW (Improved TOW) used an improved 5" (13cm) warhead and a standoff probe which allowed the shaped charge penetrator to assume a more efficient shape before it struck the target. ITOW also had an extended range of 3750m (2.33mi) compared to TOW's 3000m (1.86mi) range. BGM-71D TOW 2 has a 6" (15cm) diameter warhead, and retained a standoff probe. BGM-71E TOW 2A introduced a precursor charge in the standoff probe to defeat explosive reactive armor. BGM-71F TOW 2B is a top-attack weapon that defeats its targets with two explosively-formed projectiles that penetrate the roof of armored vehicles. TOW 2B lacks a standoff probe.